JPS6414965U

JPS6414965U -

Info

Publication number: JPS6414965U
Application number: JP11051987U
Authority: JP
Priority date: 1987-07-17
Filing date: 1987-07-17
Publication date: 1989-01-25
Anticipated expiration: 2002-07-17
Also published as: JPH073100Y2

Description

[Brief explanation of the drawing]

第１図は本発明の第１実施例にかかる密封装置
を軸受内部に設けた構造を示す上半部の縦断面図
である。第２図ないし第８図は本発明の第２〜第
８実施例にかかり、いずれも要部のみを拡大した
縦断面図である。また、第９図は従来の密封装置
を示す縦断面図である。５…外輪（外側部材）、６…内輪（内側部材）
、９，９１…環状磁石（磁性流体保持部材）、１
０…磁性流体、１３，１４，１４１…凹部（磁性
流体溜り）。 FIG. 1 is a longitudinal sectional view of the upper half of a structure in which a sealing device according to a first embodiment of the present invention is provided inside a bearing. FIGS. 2 to 8 are longitudinal sectional views of the second to eighth embodiments of the present invention, in which only important parts are enlarged. Moreover, FIG. 9 is a longitudinal sectional view showing a conventional sealing device. 5... Outer ring (outer member), 6... Inner ring (inner member)
, 9, 91... annular magnet (magnetic fluid holding member), 1
0...Magnetic fluid, 13, 14, 141... Recess (magnetic fluid reservoir).

Claims

[Claims for Utility Model Registration] (1) In a sealing device for sealing a gap between a rotating annular outer member and a stationary inner member disposed concentrically inside the annular outer member, the outer A magnetic fluid holding member having magnetic pole pieces is fixed to the inner peripheral surface of the member, and a minute annular gap is formed between the inner peripheral surface of the magnetic fluid holding member and the outer peripheral surface of the inner member, and the annular gap is 1. A sealing device characterized in that a magnetic fluid is held in the magnetic fluid retaining member, and a magnetic fluid reservoir is provided on an inner circumferential surface of the magnetic fluid holding member. (2) Utility model registration claim No. 1 in which the magnetic pole piece is formed of an annular magnet or an annular magnet and an annular pole piece made of a magnetic material fixed to one or both sides of the annular magnet. Sealing device as described in ). (3) The magnetic fluid holding member is connected to the magnetic pole piece;
Paragraph (1) or (2) of the utility model registration claim is formed by an annular pole piece made of a non-magnetic material fixed to one or both sides of this magnetic pole piece.
Sealing devices as described in Section. (4) Claim No. (1) of the utility model registration claim, wherein the magnetic fluid reservoir is a circumferentially continuous recess provided between the magnetic pole piece or between the magnetic pole piece and the non-magnetic material pole piece. The sealing device described in paragraphs ) to (3). (5) Paragraph (1) of the utility model registration claim, wherein the magnetic fluid reservoir is formed by the magnetic pole piece and the non-magnetic material pole piece having an inner diameter smaller than the magnetic pole piece. A sealing device as described in paragraph (4).